Mathematics
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    cosx+sinx/(cosx+2)^2
    5(2x-10)(x-10)=3000
    1.3x-x=150
    3n²+n=4734
    (21-3x)(10-2x)=90
    (21-3x)(10-2x)
    m*m+m=3
    1.3x-x=150
    (n+1)²-n=133
    (n+1)²-n=130
    n²+n=130
    7x^2+160x-900=0
    16x²-12x-18=0
    21:x=14:6
    x-12sin(x/2)=0
    3x-14+x=90
    4(24+x)+3x=86
    3x-3×9=6
    X*0.15+3000=X*0.36
    X*0.15+2500=X*0.36

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